Apparatus for honing flanges in cast concrete pipe



Aug. 5, 1969 H. N. DOLJGLAS 3,453,953

APPARATUS FOR HQNING FLANGES 1N CAST CONCRETE PIPE Filed Oct. 17, 1966 s Sheets-Sheet 1 flan Aw A 0006445 ATTORNEYS.

INVENTOR.

Aug. 5, 1969 H. N. DOUGLAS APPARATUS FOR HONING FLANGES IN CAST CONCRETE PIPE Filed Oct. 17, 1966 6 Sheets-Sheet 2 INVENTOR.

flan 420 4 flavours BY g4 I W ATTCRNEYS.

Aug. 5, 1969 H. N. DOUGLAS APPARATUS FOR HONING FLANGES 1N CAST CONCRETE PIPE Filed 0012. 17, 1966 6 Sheets-Sheet 5 I INVENTOR. Hon A20 AZ flamAs flu illlu w i n uw ||||,|i; M mm n 3 32 ii; N2 I I a WW Q. 9 fllllTlL MN .lillll NM .3- ylllilillll I: r 2 8; W 2% ATTORNEY 5.

Aug. 5, 1969 H. N. DOUGLAS APPARATUS FOR HONING FLANGES IN CAST CONCRETE PIPE Filed Oct. 17, 1966 6 Sheets-Sheet 4 ATTORNEYS m S 0 m Q R Rm p QR I UM v-w MM A .v 2% W Q. ll 3% UW m Em aw NNY a9 5 6 Rm Q. 3 n 30 a T l K go Aug. 5, 1969 H. N. DOUGLAS APPARATUS FOR HONING FLANGES 1N CAST CONCRETE PIPE Filed Oct. 17, 1966 6 Sheets-Sheet 5 INVENTOR. flan Aw M 0000145 ATTORNEYS.

Aug. 5, 1969 H. N. DOUGLAS APPARATUS FOR HONING FLANGES 1N CAST CONCRETE PIPE INVENTOR- ATTORNEYS.

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United States Patent US. Cl. 51119 15 Claims ABSTRACT OF THE DISCLOSURE A concrete pipe internal flange honing apparatus for grinding the flange which joins one pipe to another. The pipe is clamped in a stationary position and the grinding wheels are revolved about a center while simultaneously being rotated upon their own axes.

This invention relates to the manufacture of pipe; in particular this invention relates to an apparatus for honing a joining flange on the interior circumference of cast concrete pipe.

It is known in the prior art to cast pipes for irrigation, sewage, flood control and other systems of concrete or reinforced concrete. It is common practice in the prior art to provide a flange at an end of each section of cast pipe for receiving the end of another section of pipe. Such flanges may be cast in the pipe by means of a mold or they may be ground or honed. It is known in the prior art to move the cast pipe section into position and to rotate the pipe in contact with a honing or abrading tool. It is an object of this invention to provide an apparatus for forming flanges on the interior circumference of cast concrete pipe by holding the pipe in a rigidly fixed position and rotating and revolving a plurality of abrading tools in contact with the interior surface of the pipe.

It is a specific object of this invention to provide a novel .apparatus and mechanism for abrading concrete pipe to form a flange proximate the end of segments of the concrete pipe.

It is a further object of this invention to provide a novel mechanism for grinding flanges in concrete pipe by rotating an abrading tool in contact with the concrete pipe and revolving the abrading tool in a circular path in contact with the interior surface of the pipe.

A further object of this invention is to provide a honing machine in which the abrading tool is rotated on an axis normal to the circumference of the pipe and at right angles to the axis of revolution of the abrading tool.

It is a further object of this invention to provide a novel support means and drive means for an abrading device for honing a flange in concrete pipe.

A further object of this invention is the provision of means for supporting, gripping and holding the concrete pipe during the honing operation in the honing machine combination.

Other objects of this invention will become apparent to those skilled in the art from the following specification and from the drawings to which reference is made.

In the drawings:

FIGURE 1 is a side view of the honing machine of this invention;

FIGURE 2 is an end view of the abrading tool adjusting means taken substantially along line 2-2 of the direction of the arrows in FIGURE 1;

FIGURE 3 is a view of the interconnecting rod for adjusting the position of the abrading tools taken substantially along line 33 in the direction of the arrows in FIGURE 1; 7

FIGURE 4 is a top view in partial cross-section of the actuating plate for selectively positioning the abrad- 3,458,958 Patented Aug. 5, 1969 ice ing tools taken substantially along line 4-4 in the direction of the arrows as shown in FIGURE 1;

FIGURE 5 is a top view of the abrading tool support drum taken substantially along line 55 in the direction of the arrows as shown in FIGURE 1;

FIGURE 6 is an end view of the support drum and drive mechanism for the abrading tools taken substantially along line 66 in the direction of the arrows as shown in FIGURE 1;

FIGURE 7 is an end view of a support means for supporting the concrete pipe in position for honing;

FIGURE 8 is an additional mechanism for supporting the concrete pipe in position for honing;

FIGURE 9 is a variation of the honing machine of this invention and is taken substantially along line 99 in the direction of the arrows as shown in FIGURE 8;

FIGURE 10 is a modifidation of the honing machine of this invention shown in side view;

FIGURE 11 is an end view of the invention as shown in FIGURE 10, taken substantially along line 11-11 of FIGURE 10;

FIGURE 12 is one preferred embodiment of the invention shown in side view and partial cross-section;

FIGURE 13 is an end view in reduced scale of the invention of FIGURE 12 taken substantially along line 1313 in the direction of the arrows;- and FIGURE 14 is a preferred embodiment of the air and liquid inlet manifold and journal support construction shown in cross-section.

With reference now to FIGURES 1 to 6 which is a preferred embodiment of the invention, a concrete pipe 20 is rigidly secured in a desired position. Apparatus for positioning the concrete pipe will be described hereinafter. A flange is honed in the interior circumference of the concrete pipe proximate the end of a section thereof by forcing a plurality of abrading or honing tools, such as grinding wheels 22 and 24 against the interior surface of the pipe approximate an end thereof and rotating the abrading tool about its axis by means of a motor such as 26 or 28 which may be a compressed air motor supplied with a source of compressed air by hoses 30 and 32. Electric motors or any desired energizing means may also be used. The energizing motors 26 and 28, and consequently the grinding wheels 22 and 24 which are carried on shafts 34 and 36, are supported by rods 38 and 40 which cause the energizing motors 26 and 28 and grinding Wheels 22 and 24 to revolve about the interior circumference of the pipe in a circular path by means to be described. A source of cooling and lubricating liquid may be supplied at hoses 42 and 44. Commonly, water may be used; however, and desired cooling liquid may be used in the process and with the apparatus of this invention. In the preferred embodiment, four support arms 38, 40 and 46 and a support arm not shown for clarity, are used; however, no specific number of support arms is required for the apparatus of this invention. 7

'The support arms, for example arms 38 and 40, are selectively positioned in contact with the interior circumference of the concrete pipe by a plurality of levers 48, 49, 50, 52, 53 and 54. Levers 48 and 50, for example, are pivotally connected at one end by pins or bolts 56 and 58 to support rod 38 and are pivotally connected by pins 60 and 62 to the end 64 of a central shaft 68. Levers 52 and 54 are similarly connected by pins and 72 to rod 40 and by pins 74 and 76 to the end 64' of shaft 68. It will thus be seen that levers 48 and 50, rod 38 and the end 64 of shaft 68 form a parallelogram in which the angular p 80. Actuating rod 78 is pivotally connected by pins 82 and 84 to levers 48 and 50. Actuating rod 80 is pivotally connected by pins 86 and 88 to levers 52 and 54. Actuating rods 78 and 80 are selectively moved by operating rods 90 and 92 which are connected respectively by pins 94 and 96 to actuating rods 78 and 80 at one end and by pins 98 and 100 to a circular plate 102. Circular plate 102 is mounted on a collar 104 which is slidably received on central shaft 68 and may reeiprocably be moved thereon. Adjustment of the position of the grinding tools by adjusting the position of the circular plate 102 is accomplished by operating arms 106 which are actuated, in the preferred embodiment, by compressed air cylinders 108. The compressed air cylinder has a piston 110 included therein to which piston rod 112 is connected and is pivotally connected by pin 114 to operating arm 106. The end of air cylinder 108 is pivotally connected by pin 116 to a bracket 118 which is secured to the carriage 120. Arm 106 is pivotally connected at 122 to bracket 124 which is also secured to the carriage 120. Arm 106 carries at its distal end a pair of engaging rollers 126 and 128 which receive circular plate 102 therebetween and which are mounted on bolts 130 and 132 as best shown in FIGURE 4. Thus it will be seen that the position of the grinding tools 22 and 24 may selectively be adjusted by operation of air cylinder 108 and force may be exerted outwardly by applying air pressure to cylinder 108.

The end 64 of central shaft 68 is supported by a plurality of rods such as 134 and 136 which are attached to cylindrical drum 138, which carries the central shaft 68 in the center thereof. Drum 138 is supported by a plurality of rollers 140 and 142 which receive guide tracks 144 and 146 and which are supported by pins 148 and 150, and by vertical support bars 152 and 154 which are secured to carriage 120. Drum 138 has an extended portion 156 which carries thereon a driven sprocket 158 which is driven by sprocket 160 which is in turn driven by motor 162 which rests upon carriage 120. Drum 138 is further supported by bars 164 and 166 and by ring 168 which surrounds a cylinder 170. Cylinder 170 extends through a journal support 172 and serves as a manifold for distributing air and cooling liquid.

A source of air is supplied through pipes 174 and 176 to a rotatable joint 178 through cylinder 170 which distributes the air through elbows 180 and 182 to hoses 30 and 32 which extend through the central shaft 68. Water or other cooling liquid enters through pipe 184 and through pipe 186 and cylinder 174 from which it passes to hoses 42 and 44 for application to the grinding tool and the concrete pipe. Journal 170 is supported by a vertical support 188 which is supported by carriage 120. The manifold-journal structure is shown in greater detail in FIG- URE 14.

Carriage 120, which is best shown in FIGURE 6, comprises a pair of I-beams 190 and 192, a pair of floor plates 194 and 196, a pair of guide rails 198 and 200 which are received by rollers 202 and 204 which are, in turn, pivotally mounted by pins 206 and 208 in vertical supports 210 and 212 which may be secured to a base plate 214 which rests securely upon the floor or ground and is secured thereto by bolts 216.

The entire carriage 120 may be caused to move reciprocably by an air cylinder which includes therein a piston 220 connected to a piston rod 222 which is in turn secured to the carriage 120 by a bracket 224. The position and force exterted by movement of carriage 120 is controllably adjustable by adjusting the pressure in air cylinder 218.

Reference is made now to FIGURE 7 which shows the portion of the apparatus for holding and positioning the concrete pipe during the honing operation. The honing mechanism in the embodiment of FIGURE 7 includes a supporting floor 300 to which brackets 302 and 304 are secured by bolts 306 and 308. A first supporting lever 310 is pivotally connected to bracket 302 by pin 312 and at its distal end carries a rubber covered support bar 314 thereon, The p slti n of lever 310 may b on o l y .4 an air cylinder 316 which includes therein a piston 318 to which a rod 320 is connected. The piston rod 320 is pivotally connected by a pin 322 to the lever 310. The end of cylinder 316 is pivotally connected to a bracket 324 by a pin 326. The bracket 324 is carried upon the supporting surface 300. A second lever 328 is pivotally connected to bracket 304 by pin 330 at one end and at its distal end carries an elongated roller 332 which is pivotally mounted by a shaft 334. The position of lever 328 is controlled by an air cylinder 336 including a piston 338 and a rod 340 which is pivotally connected at 342 to the lever 328. The cylinder is connected at its lower end to a bracket 344 by a pin 346. In the preferred embodiment, the supporting surface 300 is recessed in a depression having side walls 348 and 350 below the operating level 352.

It will be apparent to those skilled in the art that the novel lever arrangement for supporting the concrete pipe during the honing operation provides means for both vertical and lateral adjustment of the concrete pipe. Thus by moving the lever 310 by means of cylinder 316, the pipe will be moved both vertically and laterally to the left, as shown in FIGURE 7. Similarly, movement of lever 328 by cylinder 336 will cause vertical movement of the concrete pipe and lateral movement to the right, as shown in FIGURE 7. A combination of movements of levers 310 and 328 will result in both vertical and lateral movement depending upon the extent of movement of the respective levers. The support floor and the supporting levers are generally recessed for convenience in working.

FIGURE 8 shows a variation of the support means for the pipe 20. In this embodiment of the invention, angular support members 354 and 356 support base plates 358 and 360 which carry thereon cylinders 362 and 364 which operate rods 366 and 368 which are connected by pins 370 and 372 to a pair of pivotally interconnected support levers 374 and 376 which are interconnected by a link 378 by means of pins 380 and 382. Longitudinal support members 384 and 386 are carried on the levers 374 and 376 to support the concrete pipe during the honing operation. The operation of the support mechanism in this invention is similar to that of FIGURE 7. That is, operation of cylinder 362 alone causes both vertical and lateral motion to the right while operation of cylinder 364 causes vertical motion and lateral motion to the left, as shown in FIGURE 8. Of course, any combination of relative movements may be used to obtain the desired lateral and vertical adjustment.

The honing machine drive and support mechanism of FIGURES 8 and 9, to whichreference is made, is a modification of the machine of FIGURE 1. The modification of FIGURES 8 and 9 includes grinding wheels or abrading tools 390, 392, 394 and 396 which are carried on shafts 398, 400, 402 and 404, which are in turn driven and supported by motors 406, 408, 410 and 412. Cooling and lubricating liquid is supplied by nozzles 414, 416, 418 and 420 in the manner described with respect to the embodiment of FIGURE 1. The cooling liquid is distributed by a hose system shown generally at 422 from a manifold 424 including a pipe 426 which is rotatably sealed to a supply line 428 by means of a coupling 430.

Operating power for the motors is supplied by air hose system 432 which is distributed by manifold 434 which is rotatably connected to supply line 436 by a rotatable coupling 438. Of course, electric motors or other drive means could be used.

The motors and consequently, the abrading tools, are supported on drum 440 by support arms 442 and 444 and additional arms not shown which include downward projections 446, 448 and 450 and an additional downward projection not shown. Cylinder 440 carries a driven sprocket 452 on the circumference thereof which meshes driving sprocket 454 which is carried by and driven by motor 456. The honing support part of the honing machine may be supported by hand or by any other con! vfinlent means to a y out he process. It woul f course.

be possible to carry out the process entirely by hand using only a hand-carried abrading tool; however, this would not be an efficient method for carrying out the process of this invention.

Reference is now made to FIGURES and 11 which show an additional variant of the apparatus and the mechanism of this invention. In this variant of the invention, an overhead carrier system is provided comprising a rail 500 on which rollers 502 and 504 are carried and which support member 506, which in turn supports a hoist 508 which may be controlled to adjust the vertical position of the honing machine. The honing machine is supported by a cable 510 and a vertical support member 512. A centrol shaft 514, which is rotatably driven by means not shown which may be of the type described hereinbefore, carries on the end thereof support arms 516, 518 and 520 and an arm not shown which support motors and abrading tools such as 522 and 524. The abrading tools are rotatably driven about their axis in the manner previously described and are revolved in a circular path by the rotation of central shaft 514. It will, of course, be realized that the distance from the abrading tools to the central shaft may be varied by any conventional means in this invention and similarly varied in the embodiment of FIGURES 8 and 9.

In this embodiment, a plurality of gripping jaws 526,

528, 530, and 532 are provided for gripping the outer circumference of the concrete pipe and holding it rigidly in place. The gripping jaws are carried by a plurality of lever pairs 534, 536, 538 and 540 which are pivotally connected to sleeve 542. The levers are operated by air cylinders 544 and 546 which are pivotally connected at 548 and 550 to the levers to be operated and the piston rods 552 and 554 are connected to the sleeve 542 at 556 and 558. It will be understood, of course, that the sleeve 542 is slidably and rotatably received on central shaft 514. Thus it will be seen that gripping jaws and operating levers are provided for maintaining the concrete pipe in a rigid position while the honing operation is in progress.

One of the more preferred embodiments of the invention is shown in FIGURE 13 and includes a base support 560 which in the embodiment is cylindrical in shape. A bracket 562 is provided which is connected by means of hook 564 and cable 566 to a power operated pulley 568 which is in turn supported by a monorail 570 through engaging means 572 which includes rollers 574 and 576.

A plurality of jaws 578 are provided in this embodiment for gripping the external periphery of the concrete pipe. Each of the jaws 578 is pivotally mounted at a joint 580 to an operating lever 582 and includes a plurality of matching apertures 584 through which a bolt may selectively be placed to fix the angular relationship between the lever 582 and the jaw 578 to accommodate different sizes of pipe. Lever 582 is pivotally mounted to a bracket 586 secured on the base support cylinder 560. An actuating air cylinder 588 is also pivotally mounted to a bracket 590 on the surface of the base support cylinder and operates a rod 592, the distal end of which is pivotally mounted to a bracket 594 on operating lever 582 to selectively position the operating lever and the jaws at a desired point. Thus by operating the air cylinder 588, the pipe to be honed may be gripped by the jaws 578.

Interiorly located in the cylindrical support is a drum 596 which has on the outer periphery thereof a pair of tracks 598 and 600 which are received respectively by a plurality of rollers 602 and 604 which are rotatably mounted in double brackets 606 and 608 respectively. Drive means for revolving. the drum are provided which include a motor 610, a gear wheel 612 operably connected to the motor 610, a driven gear wheel 614 secured to the drum and a chain 616 engaging and interconnecting the two gears. Of course, any desired drive and interconnection means may be used such as pulleys and V belts or a pair of intermeshing gears.

A hollow central shaft 618 extends through the drum 596 and the cylindrical base support 560. The central shaft 618 is supported at one end by a journal and manifold distributing means 620 in the manner generally described with respect to FIGURE 1 and to be described in further detail in reference to FIGURE 14. The manifold and journal mechanism is supported by a plurality of members 622 and 624 secured to the cylindrical base support 560.

A sleeve 626 is slidably received around the central shaft 618 and has a plurality of brackets 628 and 630 fixedly secured to the surface thereof. A positioning rod 632 is pivotally connected to the bracket 628 at one end and to a grinding motor drive means 634 through a bracket 636. A grinding wheel 638 is driven by the wheel drive means 634 in a manner previously described. In a similar manner, a positioning rod 640 is pivotally connected between bracket 630 and wheel drive means 642 through bracket 644. Drive means 642 powers a grinding wheel 646. Further selectively adjustable support for the wheel drive means 634 is provided by a pair of parallel bars 648 and 650 which are pivotally connected between bracket 636 and drum 596 by brackets 652 and 654. A pair of parallel rods 656 and 658 are similarly connected to bracket 644 and to drum 596 through brackets 660 and 662. It will thus be seen that revolution of the drum 596 by motor 610 will also cause grinding wheels 638 and 646 to revolve in contact with the interior surface of pipe 20. Positioning rods of varying lengths and pairs of parallel rods of desired lengths may be used to adapt to different pipe sizes.

The position of grinding wheels 638 and 640 is determined by the position of sleeve 626 on central shaft 618. The position of sleeve 626 is in turn controlled by a plurality of IOds 664 and 666 and two additional rods not shown for clarity. Rods 664 and 666 interconnect sleeve 626 through a ring 668 fixedly secured to sleeve 626 and a ring 670 to a sleeve 672 located through the drum 596 from sleeve 626. A ring 674 is secured to the periphery of sleeve 672 and is engaged by a pair of rollers 676 carried on the end of operating arm 678. Operating arm 678 is pivotally mounted by a bracket 680 to the interior surface of the cylindrical support 560. An air cylinder 682 through a rod 684 and a bracket 686 selectively controls the position of arm 678 and through rods 664 and 668 the position of sleeve 626. Since the sleeve 626 controls the lateral position of the grinding wheels 638 and 646, it will be apparent that these grinding wheels may selectively be positioned against the interior surface of the concrete pipe by adjusting the pressure in air cylinder 682.

Air for powering the grinding wheel air motors and water for cooling the grinding wheels is supplied through pipes 688, 690 and 691 in a manner similar to that described with reference to the embodiment of FIGURE 1.

A bracket or hook 692 is secured to cylinder 560 and supports a checking ring 693, of any desired size. The jaws 578 are positioned to permit insertion of the checking ring without unclamping the jaws.

Reference is now made to FIGURE 14 which shows the journal, manifold and rotary sealing device of FIG- URE 1. Similar mechanisms are used throughout this invention but the specific structures will be described with reference to the embodiment of FIGURE 1. A ring 168, as shown in FIGURE 1, is secured to a bearing member 694 by welding or other convenient means. Bearing member 694 extends through journal 172 and includes a grease fitting 696 thereon. It will be understood that bearing member 694 is rotatably received in journal 172.

7 Cylinder extends through bearing member 694 and receives at its outer end a pair of pipes 174 and 176 in a closure plate 698. Closure plate 698 also receives pipe 186 which is secured to and extends through the plate. It will be understood that cylinder 170 remains stationary inside the rotating bearing member 694. Rotational relation between bearing 694 and cylinder 170 is provided by a bearing member 700 which with bearing member 694 forms a raceway for ball bearings 702. Bearing member 700 is secured in place by a retaining ring 704 which is threadably received on the end of cylinder 170. Similar bearing arrangements are provided by bearing members 706 which is secured by a ring 708 and bearing member 710, bearing members 706 and 710 forming a raceway for ball bearings 712. A similar bearing is formed by members 714 and 716 and ball bearings 718.

The air which enters from pipes 174 and 176 travels through the cylinder 170 and escapes therefrom through apertures 720 to nipples 180 and 182 as shown in FIG- URES l and 14. Nipples 180 and 182 are threadably received in threaded apertures in manifold ring 722 which is bolted to ring 168. A plurality of seals 724 is provided between manifold ring 722 and cylinder 170.

Water or other cooling liquid travels through pipe 186 and apertures to conduits 42 and 44, shown in FIG- URES 1 and 14. Conduits 42 and 44 terminate in a manifold sleeve 728 which carries a lubricating fixture 730 thereon for lubricating the bearings formed by hearing members 706 and 710 and by hearing members 714 and 716. A liquid type seal is formed .by sealing gaskets 732 and cap 734. Manifold sleeve 728 is received around the manifold ring 722 and bolted thereto.

It will be seen then that ring 168, manifold ring 722 and manifold sleeve 728 are in sealed rotatable relationship with cylinder 170 and pipe 186. Of course slight structural modifications may be required to adapt the manifold journal to particular applications; however, it may successfully be used with the embodiments of this invention.

It will be apparent that the objects of this invention are provided by the apparatus described herein and shown in the drawings. It will also be apparent that there are numerous advantages to be derived from use of the apparatus of this invention. In particular, it is greatly ad vantageous to rotate the honing tools in contact with the stationary concrete pipe, both from a conservation of energy standpoint and from a precision standpoint.

The apparatus of this invention may be modified without departing from the spirit thereof. In particular, the actuating and operating sources and mechanisms may be varied. For example, while air operated motors and cylinders are described throughout, electrical, or other mechanical operating devices may, in general, be substituted therefor without departing from the invention. Furthermore, it will be realized that the invention has been described with reference to the specific embodiments of the drawings for purposes of clarity; however, the specific embodiments are intended only as exemplary of the types of mechanisms which may be used and are not intended to limit the scope of the invention which is defined in the appended claims.

I claim:

1. A cast concrete pipe honing machine comprising:

a plurality of grinding wheels for honing an interior joint portion in the end of a cast concrete pipe,

first drive means for rotatably driving the grinding wheels about the axis thereof,

support means for adjustably positioning the grinding and the rail-roll combination to thereby support the grinding wheel support.

2. The invention of claim 1 wherein the axis of rotation of the grinding wheels is at right angles to the axis of revolution of the grinding wheels.

3. The invention of claim 2 further including liquid distribution means for wetting the grinding wheels and the concrete pipe.

4. The invention of claim 1 further including gripping jaws for securely gripping the outer circumference of the concrete pipe during the honing operation.

5. A cast concrete pipe honing machine comprising:

a plurality of grinding wheels for honing an interior joint portion in the end of a cast concrete pipe,

first drive means for rotatably driving the grinding wheels about the axis thereof,

support means for adjustably positioning the grinding wheels against the interior of the concrete pipe comprising:

a plurality of support rods individually supporting the grinding wheels,

a central elongate support shaft,

a plurality of levers pivotally interconnecting the individual support rods and the central elongate shaft,

means for selectively adjusting the angular relation of the levers to the central shaft and the individual support rods to thereby selectively adjust the distance from the central shaft to the grinding wheels to hone a flange of desired diameter, and

second drive means for revolving the support means to thereby revolve the rotating grinding wheels in contact with the concrete pipe to hone a flange on the interior circumference of the pipe.

6. The invention of claim 5 wherein the selective adjusting means includes:

a circular plate slidably received on the central shaft,

operating rods pivotally interconnecting the circular plate and the levers, and

means for reciprocably sliding the circular plate on the central shaft for selectively adjusting the distance of the grinding wheels from the central shaft.

7. The invention of claim 1 further including a plurality of vertically adjustable longitudinal pipe supports for vertically and laterally adjusting the position of the concrete pipe.

8. A cast concrete pipe honing machine comprising:

a plurality of grinding wheels for honing an interior joint portion in the end of a cast concrete pipe, first drive means for rotatably driving the grinding wheels about the axis thereof,

support means including a cylindrical drum for adjustably positioning the grinding wheels against the interior of the concrete pipe,

second drive means for revolving the support means to thereby revolve the rotating grinding wheels in contact with the concrete pipe to hone a flange on the interior circumference of the pipe including:

a motor,

a drive sprocket,

means operably interconnecting the motor and the drive sprocket for driving the sprocket, and

a driven sprocket on the exterior of the cylindrical drum in operable engagement with the drive sprocket for rotating the drum when the motor is actuated.

9. A cast concrete pipe honing machine comprising:

a plurality of grinding wheels for honing an interior joint portion in the end of a cast concrete pipe,

first drive means for rotatably driving the grinding wheels about the axis thereof,

support means for adjustably positioning the griding wheels against the interior of the concrete pipe,

second drive means for revolving the support means to means engaging the monorail including a roller, and

thereby revolve the rotating grinding wheels in consupporting means for the cylindrical support intertact with the concrete pipe to hone a flange on the connecting the cylindrical support and the monorail interior circumference of the pipe, engaging means;

an overhead monorail suspending support means inand wherein the drum drive means comprises a motor terconnecting the grinding wheels support means and mounted inside the cylindrical support operatively said grinding wheel support means includes a central connected to the drum. support and drive shaft and further includes a plural- 13. The invention of claim 12 wherein the rod support ity of gripping jaws for gripping the outside of the means for the grinding wheels comprises: pipe, a pipe support slide collar slidably and rotata pair of parallel rods each pivotally mounted at one ably supported by the central support shaft, lever end to the drum and at the other end to the wheel arm actuating means pivotally interconnecting the drive means. gripping jaws and the slide collar and means for 14. The invention of claim 13 wherein the wheel posipivotally moving said lever arms for selectively tion adjusting means includes: causing the gripping jaws to grip the outside of the 15 a central shaft extending generally along the axis of pipe. the drum, 10. A cast concrete pipe honing machine comprising: a sleeve slidably mounted on the central shaft, a base support, an operating arm pivotally mounted at one end to the a drum support, sleeve and at the other end to the wheel drive means, means rotatably mounting the drum support on the base and support, actuating means for slidably positioning the sleeve on drum drive means for revolving the drum, the shaft. a plurality of grinding wheels for honing a flange on 15. The invention of claim 14 wherein the actuating the interior of the concrete pipe, means includes a ring slidably received about the central wheel drive means for individually rotating the grindshaft, an arm for controlling the position of the ring ening wheels, gaging the ring at one end and pivotally mounted to the wheel drive means for individually rotating the grindbase support at the other end and means to selectively ing wheels, position the arm. rod support means individually connected to the wheel drive means to support the grinding wheels and inter- References Cited connected to the drum support and revolved thereby, UNITED STATES PATENTS and wheel position adjusting means for selectively varying g 9/1905 Staley 144' 205 the position of the grinding wheels relative to the 26679 7/1906 Marks 144-205 r 2 305 107 12/1942 Premo 51-40 drum to maintain the grinding wheels in contact with 3008462 11/1 61 the concrete pipe during revolution of the drum. 9 W lams 125-13 ill atihe mventlon of claim 10 further mcludmg. FOREIGN PATENTS a roller engaging the rail and Australia.

40 ifi fi gffifi235 115311,? the base Support OTHELL M. SIMPSON, Primary Examiner 12. The invention of claim 10 wherein the base support U S Cl X R is a cylindrical support member and further including:

a monorail, 5190, 349; 2; 144-205 

